Ikazuchi (雷 lit. "Thunder") was an Astronaut-Type Humagear member of MetsubouJinrai.net who transformed into Kamen Rider Ikazuchi (仮面ライダー雷イカヅチ, Kamen Raidā Ikazuchi), while acting as a sleeper agent within Hiden Intelligence as Uchuyaro Raiden (宇宙野郎雷電, Uchūyarō Raiden, lit. Spaceman Raiden). He was possessed by the Ark as the third Kamen Rider Ark-Zero (仮面ライダーアークゼロ, Kamen Raidā Āku Zero), and later by the Massbrain System as Kamen Rider MetsubouJinrai (仮面ライダー滅亡迅雷, Kamen Raidā MetsubōJinrai).